Automatic stop for phonographs



H. F. SPENGLER.

AUTOMATIC STOP FOR PHONOGRAPHS.

APPLICATION FILED JULY 23,1920 1,434,412.

PatenteHov. 7, 1922.

3 SHEETSSHEU I.

H. F. SPENGLER. AUTOMATIC STOP FOR PHONOGRAPHS. I

APPLICATION FILED JULY 23,1920.

Patented Nov. 7, 1922'.

3 SHEETSSHEET 2.

H. F. SPENGLER. AUTOMATIC STOP FOR PHONOGRAPHS.

APPLICATION FILED JULY 23.1920. 1,434,412.

Patented Nov. 7, 1922.

3 SHEETSSHEE] 3.

Patented Nov. 7, i922.

To aid 'tU/lOWL it may ca mer 1i:

Be it citizen of the German dent of hill SPEDTGLER, F CI-IICELG-U, ILLINOIS.

AUTOIJIATIC STGP FUR PHONDGRAPHS.

Application filed July 23-, 1920. Serial No. 398,405.

indicates the horizontal top platrorin 0; disc record phonograph, 16 indicates the record turn table and 17 indicates tl e swinging tone arm. The turn table drawings: 15 rnnomin, a a

and a resi- Cook and HUGO l3.

Republic, Chicago, in the county of known that l 5 State of Illinois, have invented certain new of} the usual .nnd, having a depending, and useful improvements in Automatic peripheral annular flange 18 and the tone Stops for Phonographs; and I do hereby declare and exactdescription thereof, reference heing had 1 to the letters of reference marked thereon, which "form a part of this specification.

automatic stops for phonographs, and consists oil:

l /ly improved stop is that the following is a .tull, clear,

to the accompanying drawings, and

invention relates to improvements in a mounted on a recthe matters hereinafter described tangular hase plate 25, which is adapted to and more particularly pointed out in the he secured to the platform ad aCent the appended claims. The object of a simple and efficient device which may he set with reference t will automatically tion of lutions played,

inc; oit the entire record.

This others,

phonon mat Fig.

shown in Fig. 1..

Fig 3 is a horizontal 'd scale, taken on taken on the line 5-5 or Fig.

taken Fin.

view taken on 'tl' Figs. pcrspec a stop applied thereto.

L 4: is a view similar to Fig. some of which will he referred to more parh flange the tone arm, so as to partially e nd beneath and he covered by the turn table. 0 the last sound groove of said plate, extending longitudinally device along; one edge thereof, is an endwise movahle har %,.which carries a brake shoe or the invention is to provide d to he played, so that operate to stop the rotathe turn table, one or more revotion hloclr 2'7, adapted to he engaged after said last sound groove has been i n and disengaged iroin the inner surface of the peripheral flange 18 of the turn table. 9 id har 26 has longitudinal slot 2 that end normally beneath the turn table,

r 29 threaded into the to guide the bar in to insure the full and complete playohject oi the invention, as well together with the many advantages 'll more fully appear as 1 proceed o nlate 253, extends plate, normally acts to move said har outwardly so that he hrake shoe 2'? will engage the flange oi the turn tahle. :On the other or outer end of. said h'aris an upright pin 3'1, which en eges in a slot 32 in the tree, iorlce l end or a horizontally swinging lever 35:3 14:) which is pivoted to the plate by a screw 34.

An operating lever 35 is pivoted at about its middle to swing in a horizontal plane, on a screw 36 lined to the hase plate The shorter arm 37 of the lever has a thumb screw 38, while the longer arm 39 of said l ever projects into the vicinity of the forked end the lever and has a depending pin 40 which engages the torked end of said lever. h leaf spring 41 which is tired to the shorter arin o the lever 35 and engages 'aph showing my improved auto- 2 is a side elevation of the parts sectional view, on an the line 83 of 3 hut with wn in changed relation. sectional view sectional view ectional view the parts sho is a vertical detail Fig. 6 is a vertical detail 11 the line 66 of Fig. 7 is a vertical detail s S another vertical detail sectional 1e line 8--8 of Fig. 3.

9, 10, 11., 12,13 and 1a are detail tive views of. parts of the automatic d w ith my specification.

to that cnihc liin the as l procee o. nor in detail if the invention illustrated screw 41-5, beneath the turn tahle iovement. lllreatspring 30 fixed to said The free end of said spring has a longitudinal slot 47 and near the middle of said spring on its under side, is a depending catch pin as, the bottom surface of which is inclined as shown in Fig. 5. As the lever 35 is moved from the position shown in Fig. 3 to that shown in Fig. 4, its pin will swing the lever 33 about its pivot 34 and at the same time will move the brake bar 26 inwardly against the action of the spring 30, removing the brake shoe 27 from the turn table flange 18. As the lever 33 thus swings, its inner edge which is beveled, engages the inclined surface of the pin 48 of the spring lo and ele ates the same so that it passes beneath the pin which thereafter engages the outer edge of said lever and holds it together with the bar 26 in the position shown in Fig. 4;, wherein the turn table is free to rotate. lVhen the spring is again actuated, as will be hereinafter described, to release the arm 33, the spring 30 will move the bar 26 outwardly, so that the brake shoe 27 will again engage theflange of the turn table and stop the same.

Means are provided to retard the too rapid in and out movement of the brake bar 26 and such means is as follows:

Secured to the base plate near the spring 30 of tie bar 26 is a shallow, rectangular casing 50 (see Fig. On a vertical pin. 51 in said casing is pivoted a segmental gear 52 which has an arm 53, the outer end of which is connected as at 5ito the bar 26 a point between the brake shoe 2? and the slot 28. The segmental gear 52 meshes with pinion. 55 made integral with la ger gear 6 on an upright pin 5. spaced from the in 51. The gear 56 meshes with two pinions 58 on pins 59, said pinions carrying radial fan blades 80. Thus while the bar 26 is moying inv-Jardly or outwardly. it will rotate the gearing in the casing which by reason of the resistance thereof, togethenwith the resistance of the fan blades, will act to retard or governv the movement of the bar 26 when the lever is released. l 'Vhil-e I have illustrated and described this particular form of governor, I wish it to he understood that I am not limiting myself thereto, as I may as readily employ any other means whirh will retard the movement of the bar 26. r rising from the base plate 25 at a point between the pivot screws 3%36 is an upright standard 6.2, which includes an arcuate extension 63 struclr about the vertical axis of the tone arm as center (see Figs. 2. 3 and 7 The extension 68 overhangs a part or the lever 33 and the forked end of the associated spring arm 45. Fixed to the top surface of said standard and extension is an arcnate block 65 (see Fig. 7 and Fig. 9)

l n has hoi ontal slot 66 in that end aborcthe standard 62 and a vertical groove in its inner surface near its other end.

The block is of a radial width less than that of the standard. and its extension so that an outwardly extending radial flange 68 (see Fig. 5) is provided at the bottom outer surface of said block.

Frictionally engaged against the outer surface of the block 65 is an arcuate edgewise arranged plate 70, bottom edge upon the flange 68. Said plate has a notch '71 in its top edge near one end and has a longitudinal slot 72 which opens through its other end. A leaf spring 73 fixed in the slot 66 of the block 65 by screws 74 and engaging with the bottom wall of the slot Y2 in the plate '70 holds said plate against the flange 68, while a coiled spring on. a thumb screw T6 which extends through the slot '[2 in the plate '70 and is threaded into the block 65, acts to frictionally hold said plate in position with respect to the block 65.

In the vertical groove 6'? of the block 65 is slidably arranged a T-sh.g 3ed member 80 (see Fig. 10) which includes an upright slotted body part 81, a top arcuate cross head 82 and a bottom cam foot or extension 83, arranged at rightangles to the cross head. A screw 84- (see Fig. 5) extending through the slot in the body threaded into the block 65, holds said f member 80 in place in the groove 67 so that it may more vertically therein. The cam foot or extension 83 is beveled outwardly and upwardly toward its free end which overhangs a part of the long arm 39 of the operating lever.

On the upright part of the tone arm in line with, but below the horizontal part thereof, is a horizontal bracket arm 90 which has a longitudinal groove 91 opening through its bottom surface (see Fig. 5). In said groove is a pawl or detent 92 which swings vertically about its inner pivoted end 93. h leaf spring 94 fixed in said groove acts to swing saidpawl downwardly, across pin 95 i ;l1e arm limiting this downward movement. In the bottom edge of the pawl near its free end is provided a notch 96 which registers with the cross head 82 of the T member 80; The bracket arm 90 is made long enough to overhang the arcuate plate so that in the operation of the tone arm as it moves under tne action of the sound groove, the bottom surface of the said pawl will have sliding engagement on the top edge of the arcuate plate 70. I

On tl outer surface of the upright post before mentioned, arising from the plate is mounted. so. as to move in vertical plane, a trip plate 98 (see Figs. 5 and 11). This plate is preferably arranged in the plane of radial line extendin I between the the tone and the T member 80 axis of before mentioned. The upright part 99 of said trip pi. e has -wertical slot through which screws 100 on the standard 42 extend,

which rests at its' is o i the tone arm because of the engagement (iii 1 nee-n12 so that the trip plate is capable of a vertical sliding, guided movement on said standard. At the top end of said upright part 99 is a horizontal extension or platform 101, by means of which said trip plate is actua ed.

The bottom end of said upright part 99 normally rests upon one end of a rocking block 102 (see Figs. 6 and 12), the other end oi which extends beneath the slotted end the spring arm 45. An upright pin 103 on said last mentioned end oi the rocker engages within the slot 4:? of said spring arm. Between its end said rocker has a tapered hole 104. in whiehis engaged a pin 105, rising from the base plate 25. hole are so related that the rocker is capable of a limited vertical rocking movement on the plate 25 but is held against a horizontal swinging movement by reason 01' its pin connection with the spring arm 45, Thus when pressure is exerted upon the platit'orm 101 01 the trip plate 98, its bottom end will depress the associated end of the rocker and lift the other end which in turn will lift the slotted end of the'spring arm and thus release the lever 38 from its locked position shown in Fig. i.

The operation of the stop is follows:

Assume that the parts are in the position shown in Figs. land 3 wherein the brake shoe 27 has engaged the flange 18 ot the turn table 16 and stopped its rotation, and the latch 92 is engaged in the notch 71 in the arcuate plate "(0. The record just played is removed in the usual manner and another record is placed upon the turn table. The tone arm is moved inwardly to bring the stylus 21 into register with the last active sound groove of the record. in this movement of the tone arm to set the stop as a whole with reference to the last sound groove, the 'trictionally held arcuate plate moves about the arcuateblock with the latch 92 within the notch 71 in said plate 70. Thus is this notch brought into its proper position with reference to the last sound groove of the record now to he played. As the last sound grooves or dirler ent records vary in diameter the device may be readily set in this manner to meet the requirements 01"". each individual record to be played.

The knob 38 of the lever 35 next swung; toward the base of the tone arm 17 by thumb pressure. This will swing itsdother end in the opposite direction, when by reason of the pin. 40. a swinging movement will be im parted to the lever and simultaneously an endwise movement is imparted to the.

brake bar 26 so that the brake shoe 2? is moved away from the turn table flange .3 to release the. same which now starts its rotation. As the lever swings to the lei t. as shown in the drawings, it will engage the Said pin and inclined surfaced pin 48 on the spring arm 45 and lift the same to pass beneath, when said pin will engage the other side of the lever and lock it in this position. As the bar 26 moves. it will actuate the governor mechanism in the casing 50 in one direction.

The operating lever 35 when operated will at the same time strike the inclined surface of the toe 83 on the member 80 and lift the same vertically. The .cross head 82 of said member being inengagement i f h the pawl 92, will lift the same to release from the notch 71 in the plate 70. lVith the tone arm pawl thus released. said tone arm may now be swung about its vertical axis to bring the stylus into position to engage the starting groove of the record. The stylus is then inserted into the starting sound groove and the playing commences.

its the tone arm swings towardthe last sound groove of the record under the action of the stylus following the sound grooves. the pawl 92 will slide along the top edge of the arcuate plate 70 until it registers with the notch 71 in said plate, which registration talzes place w en the stylus has reached the last sound groove at the record. "When the pawl thus registers with the notch '71 the spring 94. will swing the pawl 92 down wardly into the notch. Simultaneously therewith. said pawl will strike the platform 101 or the member 98 and depress the same so as to tilt the rocker 102. This will elevate the forked end of the spring arm {5 to lift the pin 4-8 out of locking engagement with the lever 33. to release the same; lVhen this lever is thus released the leat spring 30 will move the brake bar 26 outwardlv. This outward movement is slowed down or retarded under the action of the governor mechanism in the casing 50. sothat a period of time elapses between the time when said stylus reaches the last sound groove and the brake shoe engages the turn table flange. which period of time permits oi one or more rotations of the turn table to insure a tull and. complete playing of the record.

.Vhen another record is to be played, the stylus is set with reference to the last sound groove. of that record as before described.

The advantage of the invention is anparent. A full and complete pla ing; of the recordis provided for by permitting one or more rotations of the turn table after the stylus reaches the last sound groove.

The device may be attached to anv disc record phonograph and is positive and automatic in its operation.

While in describing; my invention. 1 have referred to certain details of mechanical construction and arrangement of parts. I do not wish to be limited. thereto. except as may be pointed out in the appended claims.

I claim as my invention 1. A device of the hind described, comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe normally acting to engage the turn table, means for holding said brake shoe away from the turn table and operable when the stylus of the tone arm engages the last sound groove of the record. being played to release said brake shoe, and means retarding the movement of the brake shoe toward the turn table to permit one or more rotations thereof before said brake shoe engages and stops said turn table.

2. A device of the kind described, comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe normally acting to engage the turn table, means for holding said brake shoe away from the turn table, means for releasing the brake shoe holding means when the stylus of the tone arm reaches the last sound groove of the record being played, said means being capable of adjustment'to meet the variation of diameters of the last sound groove of different records, and means retarding the movement of the brake shoe toward the turn table to permit one or more rotations thereof before said brake shoe engages and stops said turn table.

3. A device of the kind described. compris ing in combination with the turn table and the tone arm of a phonograph, a brake shoe adapted to engage the turn table, a manually operable lever for moving said brake shoe out of engagement with said turn table, a catch for locking the brake shoe in this position, a trip member actuated when the stylus reaches the last sound groove of the record being played, for releasing said brake shoe locking catch, and means retarding the movement of the brake shoe toward the turn table when released to permit one or more further rotations of the turn table beforesaid brake shoe engages and stops said turn table.

4. A device of the kind described comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe adapted to engage the turn table, a manually operable lever for moving said brake shoe out of engagement with said turn table, a catch for locking the brake shoe in this position, a trip member actuated when the stylus reaches the last sound groove of the record being played for releasing said brake shoe locking catch, a plate controlling the operation of said trip member, adjustable with reference to the last sound groove of the record to be played, and means retarding the movement of the brake shoe toward the turn table when released, to permit one or more rotations of the turn table before said brake shoe engages and stops said turn table.

5. A device of the kind described, comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe adapted to engage the turn table, a

manually operable lever for moving said the operation of said trip member, a pawl carried by the tone arm and operating in the setting of the stylus with reference to the last sound groove of the record to be played, to set said plate so that said pawl will actuate the trip to release the brake shoe when said stylus reaches said last sound groove, and a governor for retarding the movement of the brake shoe toward the turn table when released, to permit one or more rotations of the turn table before said brake shoe engages and stops said turn table.

.6 A device of the kind described, comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe bar, aspring normally acting to engage the brake shoe with the turn table, a lever for moving said brake shoe bar against the action of said spring to disengage the brake shoe from the turn table, a catcl member for holding said brake bar in ti o last mentioned positioma trip plate for releasing the catch, a pawl carried by the tone arm for actuating the trip member to to lease the catch, when the last sound groove of the record has been reached, and a mecha nism connected to the brake bar to retard the movement of the same, to permit one or more rotations of the turn table before the brake shoe engages andv stops the rotation of said turn table.

7. A device of the kind described, comprising in combination with the turn table and the tone arm of a phonograph, a brake shoe bar, a spring normally acting to engage the brakeshoe with the turn table, a lever for moving said brake shoe bar against the action of said spring to disengage the brake shoe from the turn table, a catch memher for holding said brake bar in the last mentioned position, a trip member for releasing the catch, apawl carried by the tone arm for actuating thetrip member to release the catch when the last soundgroovc of the record has been reached, a plate upon which said pawl engages as the tone arm swings inwardly in following the sound groove of the record, said plate having a notch therein to permit the pawl to actuate the trip plate, and a mechanism connected to the brake bar to retard the movement of the same towards the turn table to permit one or more rotations of the same before the brake shoe engages and stops said turn table.

1 ssam 8. A device of the kind described cone prising in combination with the turn tahle and tone arm of a phonograph. a brake shoe bar, a spring normally acting to engage the brake shoe with the turn table a lever for moving said brake shoe bar against the action of said spring to disengage the brake shoe from the turntable, a catch menober for holding said brake bar in the last mentioned position, a trip member tor releasing the catch, a pawl carried by the tone arm for actuating the trip member to release the catch when the last sound groove of the record has been reached a plate upon which said pawl engages as the tone arin swings inwardly in following the sound groove of the record said plate having a notch therein to permit the pawl to actuate the trip plate, a mechanism con nected to the bra-l re bar to retard the movement of the same towards the turn table to permit one or more rotations of the $211116 before the brake shoe engages and stops the turn table, and means operable in the movement of the lever to lift said pawl out or said notch.

In testimony that l claim as my invention I ai'tix my the presence of two witnesses, of July A. D. 1920.

HUGO F. iPENG-LER.

the foregoing signature in this 20th day Witnesses:

T. H. ALrREDs, L. RUTH MEHLHOPE. 

